高分散型纳米级Pd/Fe对4-氯苯酚的还原脱氯

Reductive dechlorination of 4-chlorophenol by highly dispersed Pd/Fe nanoparticles

氯酚类化合物在医药、农药、塑料、抗氧剂、涂料、制革和造纸等生产过程中有着广泛的应用，是首批列入斯德哥尔摩国际公约的12类持久性有机污染物（POPs）之一，属于典型的环境雌激素[1]。因此，如何修复氯酚类化合物对环境的污染已成为当今环境科学界迫切需要解决的问题。

Highly dispersed Pd/Fe nanoparticles were prepared by using ultrasound-assisted liquid phase reductive method, and used for reductive dechlorination of 4-chlorophenol （4-CP）. The affecting factors and degradation kinetics were investigated. The experimental results showed that： obvious modification was achieved on the particle size, most of them less than 100nm, and on specific surface areas, increased 43.42%. The efficiency of 4-CP reductive dechlorination was up to 97% on the Pd/Fe nanoparticles with Pd mass fraction 0.2% and its dosage 2.5 g · L -1 at the conditions： time 300 rain, initial 4-CP concentration 20 mg · L-1 , pH value 3.0, and reaction temperature 30℃. The degradation reaction of 4- CP followed pseudo-first-order kinetics and the apparent pseudo-first-order kinetics constant was 1.76 × 10-2 min-1.